When/why did daylight saving time start?
Daylight saving time started in the United States during World War I. It started with an aim to save fuel that is by reducing the need to use artificial lighting. Check out more information at http://en.wikipedia.org/wiki/Daylight_saving_time.
Daylight savings started during World War 1. The purpose of it is because in the summer, you can have an extra hour of daylight instead of using lamps or lights, so you can save energy.